RDFCoreWGCharter
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<?xml version="1.0" encoding="iso-8859-1"?>
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<title>
W3C Semantic Web: RDF Core Working Group Charter
</title>
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<p>
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</p>
<h1>
W3C RDF Core Working Group Charter
</h1>
<blockquote> <em>Per section <a
href="http://www.w3.org/2003/06/Process-20030618/groups.html#GAGeneral">6
Working Groups, Interest Groups, and Coordination Groups</a> of
the W3C Process, this charter, and any changes to it, take effect
by way of an announcement to the W3C Membership via <a
href="http://lists.w3.org/Archives/Member/w3c-ac-members/">w3c-ac-members</a>.</em></blockquote>
<h2>
1. Purpose and Scope
</h2>
<p>
This is the charter for an <a href="RDFCore/">RDF Core Working
Group</a>, managed under the <a href="/2001/sw/">W3C Semantic Web
Activity</a>. Implementor feedback concerning the RDF <a
href="http://www.w3.org/TR/1999/REC-rdf-syntax-19990222/">Model
and Syntax Recommendation</a> points to the need for a number of
fixes, clarifications and improvements to the specification of
RDF's abstract model and XML syntax. There is also considerable
interest in the exploration of alternative XML serialization
mechanisms for RDF data. The role of the RDF Core WG is to
prepare the way for such work by stabilizing the core RDF
specifications. The RDF Core WG is neither chartered to develop a
new RDF syntax, nor to reformulate the RDF model. However, the
group is expected to re-articulate the RDF model and syntax
specification in such a way as to better facilitate future work
on alternative XML encodings for RDF.
</p>
<p>
The RDF Core WG is chartered to complete the work on RDF
vocabulary description present in the <a
href="http://www.w3.org/TR/2000/CR-rdf-schema-20000327/">RDF
Schema Candidate Recommendation</a>. The Working Group will
address questions and issues raised on the public comments
feedback list and the RDF Interest Group list during the
Candidate Recommendation period and will produce an updated W3C
specification. The specific type of Technical Report to publish;
whether Working Draft, updated Candidate Recommendation, or
Proposed Recommendation will be decided by consensus of the
Working Group according to the number and nature of any changes
that are made to the previous version.
</p>
<p>
Following the <a
href="http://www.w3.org/TR/1999/NOTE-schema-arch-19991007">Cambridge
Communique</a> meeting, feedback received on the RDF Schema
Candidate Recommendation, and ongoing discussions in the XML and
RDF developer community, the RDF Core WG must provide an account
of the relationships between the basic components of RDF (Model,
Syntax, Schema) and the larger XML family of recommendations.
</p>
<h2>
2. Requirements
</h2>
<p>
RDF provides a common framework for representing metadata across
many applications. The semantics and structure of many varieties
of metadata will be specified by independent communities. RDF
provides an infrastructure that is sufficiently general and
flexible to support these disparate applications.
</p>
<p>
In order to support interoperability across these disparate
applications, a clarification and re-articulation of the core RDF
specifications is required. The RDF Core WG must address the
issues raised on www-rdf-comments against the RDF Schema 1.0
Candidate Recommendation and the RDF Model and Syntax
Recommendation.
</p>
<h3>
Deployment Considerations
</h3>
<p>
Backwards compatibility with existing RDF applications is a
priority for the RDF Core Working Group. Since the web is in
continuous operation, it is the responsibility of this working
group to ensure graceful deployment of corrections to the RDF
specifications by carefully considering both the impact of new
RDF documents on extant software, and the impact of revised
software on extant documents.
</p>
<p>
At the same time, since the web is growing rapidly, it is the
responsibility of this group to not let near-term deployment
considerations grossly increase the future costs (to
implementors, authors, users, etc.) of new features.
</p>
<h3>
RDF Model and Syntax Requirements
</h3>
<p>
The RDF Core WG must address the issues listed in the <a
href="http://www.w3.org/2000/03/rdf-tracking/">RDF Issue
Tracking</a> document, liaising (via the Semantic Web
Coordination Group) with other W3C groups where issues need to be
addressed at a cross-WG level.
</p>
<p>
The RDF Core group must take into account the various
formalizations of RDF that have been proposed since the
publication of the RDF Model and Syntax Recommendation. The group
is encouraged to make use both of formal techniques and
implementation-led test cases throughout their work.
</p>
<h3>
RDF Schema Requirements
</h3>
<p>
The goal of RDF Schema is to support an incrementally extensible
approach to representing semantics in machine understandable form
and to provide a simple base that can be extended by more
powerful representational systems. The RDF schema system must
provide an extensibility mechanism to allow future work (for
example on Web Ontology and logic-based Rule languages) to
provide richer facilities.
</p>
<p>
RDF Schema must be expressed in terms of the RDF model, and must
use W3C RDF syntax. RDF Schema must use and build upon XML Schema
datatypes to the fullest extent that is practical and
appropriate. Specifically, the RDF Core Working Group is not
chartered to develop a separate data typing language that
duplicates facilities provided by XML Schema data types.
</p>
<h2>
3. Relationships and Dependencies
</h2>
<p>
Coordination with other groups will be managed through the <a
href="http://www.w3.org/2001/sw/CGcharter">Semantic Web
Coordination Group</a>.
</p>
<p>
The Topic Maps community have produced an XML-based Topic Map
serialization syntax (XTM), and the W3C XML Protocol Working
Group is already chartered to produce a similar mechanism. The
XML Protocol Working Group Charter lists as a goal the creation
of a <a
href="http://www.w3.org/2000/09/XML-Protocol-Charter#representation">
"mechanism for serializing data representing non-syntactic data
models such as object graphs and directed labeled graphs, based
on the datatypes of XML Schema"</a>. The RDF Core WG will need to
liaise with the XML Protocol Working Group and XTM communities to
ensure that the RDF Core specifications are produced with
consideration for possible future work on alternate RDF syntaxes.
</p>
<h2>
4. Deliverables
</h2>
<p>
The RDF Core WG is expected to begin work upon announcement of
the Semantic Web Activity, and to meet face to face between two
and four times prior to completion of their work in <span class="mod">mid 2004</span>.
</p>
<h3>
Deliverables
</h3>
<p>
The deliverables of RDF Core WG are as follows.
</p>
<ul>
<li>
update and maintain the RDF <strong>Issue Tracking</strong>
document
</li>
<li>
publish a set of machine-processable <strong>test
cases</strong> corresponding to technical issues addressed by
the WG
</li>
<li>
provide an update of the <strong>errata and status
pages</strong> for the RDF specifications
</li>
<li>
update the RDF <strong>Model and Syntax Specification</strong>
(as one, two or more documents) clarifying the model and fixing
issues with syntax
</li>
<li>
complete work on <strong>RDF Schema</strong> 1.0 Specification
</li>
<li>
provide an account of the <strong>relationship between RDF and
the XML family of technologies</strong> (particularly Schemas
and Infoset/Query)
</li>
</ul>
<h3>
Schedule
</h3>
<div class="mod">
<p>
The following schedule is planned. Revisions of this schedule
must be agreed through the Semantic Web <a
href="CGcharter">Coordination Group</a>.
</p>
<ul>
<li>
Last Call : Jan 2003
</li>
<li>
Proposed Recommendations: June 2003
</li>
<li>
Recommendation : 10 Feb 2004
</li>
<li>
Errata / Wrap-up : Feb 2004 - May 2004
</li>
</ul>
<p>
The group is expected to close down in mid 2004.
</p>
</div>
<h2>
5. Meetings and WG Membership
</h2>
<p>
The Working Group will conduct its primary discussion via
electronic mail. The mail archive will be publicly readable,
however posting to the mailing list will be restricted to Working
Group participants. Public input should be via the <a
href="http://lists.w3.org/Archives/Public/www-rdf-comments/">www-rdf-comments</a>
list, to which this Working Group will be expected to read and
respond.
</p>
<p>
Working Group members will need to be familiar with the RDF Model
and Syntax Specification, RDF Schema 1.0 Specification, and other
related XML specifications (particularly XML Schema), and will
ideally have implementation experience with RDF-based
applications.
</p>
<p>
Teleconferences and face to face meetings will be scheduled as
necessary to facilitate the work. Two to four face to face
meetings are anticipated. Participants will be expected to
typically devote a minimum of twelve hours per week, exclusive of
face-to-face meetings, to this working group. Maintaining
communication with the wider RDF developer community through <a
href="/RDF/Interest/">RDF Interest Group</a> channels (<a
href="http://lists.w3.org/Archives/Public/www-rdf-interest/">www-rdf-interest</a>,
<a
href="http://lists.w3.org/Archives/Public/www-rdf-logic/">www-rdf-logic</a>,
<a href="http://www.w3.org/RDF/Interest/#irc">IRC chat</a>) will
also be important aspects of the group's work.
</p>
<p>
Participation in the Working Group is available to individuals
nominated by their W3C Advisory Representatives. The Working
Group chairs may grant <a
href="/Consortium/Process/Process-19991111/organization.html#invited-expert">
invited expert</a> status to other members of the Web community
at their discretion.
</p>
<h2>
<a id="IPR" name="IPR">6. Intellectual Property</a>
</h2>
<p>
W3C promotes an open working environment. Whenever possible,
technical decisions should be made unencumbered by intellectual
property right (IPR) claims.
</p>
<p>
This is a Royalty Free Working Group, as described in W3C's <a
href="http://www.w3.org/TR/2002/NOTE-patent-practice-20020124">Current
Patent Practice</a>, dated 24 January 2002.
</p>
<p>
Working Group participants disclose patent claims by sending
email to <tt>patent-issues@w3.org</tt>; please see <a
href="http://www.w3.org/TR/2002/NOTE-patent-practice-20020124">Current
Patent Practice</a> for more information about disclosures.
</p>
<p>
W3C promotes an open working environment. Whenever possible,
technical decisions should be made unencumbered by intellectual
property right (IPR) claims. W3C's policy for intellectual
property is set out in <a
href="http://www.w3.org/Consortium/Process/#ipr">section 2.2 of
the W3C Process Document</a>.
</p>
<h2>
7. Contacts
</h2>
<p>
The chairs of the group are <a
href="mailto:brian_mcbride@hp.com">Brian McBride</a> (<a
href="http://www.hpl.hp.com/">HP Labs</a>) and <a
href="mailto:danbri@w3.org">Dan Brickley</a> (<a
href="http://www.w3.org/">W3C</a>/<a
href="http://ilrt.org/">ILRT</a>)
</p>
<p>
The W3C staff contact is <a href="mailto:em@w3.org">Eric
Miller</a>, Semantic Web Activity lead.
</p>
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